It's the Ascalon Catacombs greatsword. The weapons have a different appearance during night and day. At night they emit a ghostly blue aura. You can purchase the greatsword for 390 Ascalonian Tears from the reward vendor in Lion's Arch.

It's the Ascalon Catacombs greatsword. The weapons have a different appearance during night and day. At night they emit a ghostly blue aura. You can purchase the greatsword for 390 Ascalonian Tears from the reward vendor in Lion's Arch.